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<p>[QUOTE=&quot;Pete Apple, post: 24630253, member: 103982&quot;]<b>Many dimes from the 1960s through 1980s are found with a poorly struck perimeter. It appears to stem from a combination of inadequate upset and excessive die convexity (primarily on the obverse die). {Ref: Mike Diamond}</b></p><p><br /></p><p><b>In addition, many of the 1985-P and 1985-D dimes show an error that appears to have been struck from one of a number of improperly heat-treated obverse dies. The improper heat treating caused die sinking, manifested most prominently as flattening and excessive concavity near the rims of the coins. This effect is seen on many 1985 dimes from both Denver and Philadelphia Mints (with all the dies being made in Philadelphia during that era). The reverses of these coins are most often weakly struck from well-worn dies, the weakness due to poor fit-up of the dies caused by the defective obverse dies and die wear - the effect seemingly progressive. The areas of greatest flattening on the obverses shift around the circumference of the coins (sometimes showing strongly in more than one area) suggesting uneven heat treating from the dies involved. Insufficiently upset planchets (or blanks) and Misaligned dies have also been identified as possible causes of these errors on 1985 dimes also, but the coins suggest otherwise in that this effect is largely restricted to one year/denomination, can be found in both Denver and Philadelphia Mints, appears progressive on both obverse/reverse, and is so prolific. Minor at best considering how many there are but still an error caused by a mistake in the processing of dies inside the Mint unrelated to normal die wear. {Ref: Ken Potter}</b></p><p><br /></p><p><br /></p><p>[ATTACH=full]1566618[/ATTACH][/QUOTE]</p><p><br /></p>

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